We seem to have an early contender for "father of the year" here, this one representing dads in China: Lingzi Luo put his engineering experience designing mini cars to good use and constructed his son a one-of-a-kind streamline carbon fiber body, LED light, full suspension and transmission equipped, and electric motor operated beauty.
I'd guess as Lingzi's lad grows up, the speed limit will get lifted with the agreement of "Don't tell mom!" and a helmet. You might also want to not tell mom about the $15,000 price tag.
Discussion about Lingzi's project car for his son over at Reddit